/*
 * Copyright (C) 2012 ARM Ltd.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#include <seminix/linkage.h>
#include <seminix/pagesize.h>

/*
 * Copy a page from src to dest (both are page aligned)
 *
 * Parameters:
 *	x0 - dest
 *	x1 - src
 */
ENTRY(copy_page)
    ldp	x2, x3, [x1]
    ldp	x4, x5, [x1, #16]
    ldp	x6, x7, [x1, #32]
    ldp	x8, x9, [x1, #48]
    ldp	x10, x11, [x1, #64]
    ldp	x12, x13, [x1, #80]
    ldp	x14, x15, [x1, #96]
    ldp	x16, x17, [x1, #112]

    mov	x18, #(PAGE_SIZE - 128)
    add	x1, x1, #128
1:
    subs	x18, x18, #128

    stnp	x2, x3, [x0]
    ldp	x2, x3, [x1]
    stnp	x4, x5, [x0, #16]
    ldp	x4, x5, [x1, #16]
    stnp	x6, x7, [x0, #32]
    ldp	x6, x7, [x1, #32]
    stnp	x8, x9, [x0, #48]
    ldp	x8, x9, [x1, #48]
    stnp	x10, x11, [x0, #64]
    ldp	x10, x11, [x1, #64]
    stnp	x12, x13, [x0, #80]
    ldp	x12, x13, [x1, #80]
    stnp	x14, x15, [x0, #96]
    ldp	x14, x15, [x1, #96]
    stnp	x16, x17, [x0, #112]
    ldp	x16, x17, [x1, #112]

    add	x0, x0, #128
    add	x1, x1, #128

    b.gt	1b

    stnp	x2, x3, [x0]
    stnp	x4, x5, [x0, #16]
    stnp	x6, x7, [x0, #32]
    stnp	x8, x9, [x0, #48]
    stnp	x10, x11, [x0, #64]
    stnp	x12, x13, [x0, #80]
    stnp	x14, x15, [x0, #96]
    stnp	x16, x17, [x0, #112]

    ret
ENDPROC(copy_page)
